How would I import/export Blender's preferences?
Depending which OS you're on, navigate to:
Linux
~/.config/blender


Mac
/Users/username/Library/Application Support/Blender/
Windows
%APPDATA%\Blender Foundation\Blender

Once there you should see folder(s) corresponding to the version(s) you currently have.

In my case here I have 2.66 and 2.67, just open the previous folder (2.66) since I had saved my settings there earlier and copy the config folder to the new one (2.67). What you really want however is the startup.blend and userpref.blend inside.